Calculating machine



O. O. MARTIN CALCULATING MACHINE Filed May 13, 1921 6 She ets-Sheet 1Feb. 3, 1925.

O. O. MARTIN CALCULATING MACHINE Filed May 13, 1921 6 Sheets-SheetINVENTUR Feb. 3, 1925.

O. O. MARTIN CALCULATI NG MACHINE 6 Sheet s-Sheet 5 Filed May 13, 1921lNVENTUR Feb. 1925- 1,525,311

0. o. MARTIN CALCULATING MACHINE Filed May 13, 1921 6 SheetS-Shet 4 -11;=3 INVENTEIRII Feb. 3, 1925.

O. O. MARTIN CALCULATING MACHINE 6 Sheets-Sheet 5 Filed May 13, 1921NVBNT'EIR @ZWLQ 711m F b. 3, 1925. v 1,525,311

I o. o. MARTlN CALCULATING MACHINE Filed May 15, 1921 6 Sheets-She t elNVEINTEIR I Patented 3, 1925.

To all whom it may concern.

A 1 5 1 UNITED STATES PATENT OFF-ICE.

0mm 0. mm, or cnrcaeo; rumors, assgonon ro. numeral: accoume .ncmoonrounon, or new max, 1:.- Y., a coarona'rrox or-mrw'vom cancunarmonacnmn Application me Kay 1:, 1921'. Serial 1:... 400,200.

to en- Be it known that I, OLIVER a citizen of the United States,residing at Chicago, Cook County, State of Illinois, have invented newand useful Improvements in Calculating Machines, lowing is aspecification.

This invention has relation to computing devices and it is. particularlydirected to means for operatin such devices.

A certain type 0% adding-subtracting machines is designed for attachmentto typewritin machines, and the digit mechanism of sucl devices'isordinarily connected with the numeral keys of the typewriter, with theresult that the digit which the key represents is registered in thecomputing machine each time the key, is depressed. t is well known thatthe less force an o erator is compelled to exert in depressing t e keysof the ty ewriter, and the more rapidlfy the keys 0 the typewriter maybe operated, the greater the usefulness and the commercial success ofthe machine, and anything which tends to interfere with such freeperation of the typewriter is considered 0 o jectionable. Certaincomputin attachments of the type herein consider such as F the Wahladding and subtracting machine in connection with which I have describedthe invention, are designed to be operated at very high speed, but theforce required to o erate such machine in combination with tiletypewriter to which it is attached, is necessarily much greater than theforce needed for the operation of the typewriter aone. It is also foundthat a different keytouch is required, and that the operator iscompelled to change from the ordinary snappy typewriter touch to an evenstroke carryingt e key to the bottom-of its movement eve time a numeralkey is depressed.

The prmcipal objectv of my invention is the provision of drivin meansfor such comut1n machine capab e of taking the extra lbad romthetypewriter key, inv order that the regular typewriter touch may beemployed continuously. A further object is the provision of means forthe purpose specified and attachable to such typewriter-computingmachine withouhaltering the construction of the machine. Another ob'ectis to provide a mechanism compact enoug to fit into the very limitedspace above the typewriter keyboard and below the computing machine, andyet substantial enou h 0. MARTIN, d ll of which the fol ure the severestrain are subjected to.

The further objects of the invention and which suc devices its numerousfeatures of special importanc e will be readily appreciated upon readingthe following description; they are concisely set forth in the annexedclaims; and they are fully illustrated in the appended drawings, ofwhich:

Fig. 1 is a sectional side elevation through a typewriter-computingmachine embodying the invention, and all such parts as are not necessaryin order to disclose the method of attachm the devices to the ty ewriterhave been omitted for the sake of cl earness, Fig. 2 is afrplnthelevation suliistantially 1n agreement wit t e reced' re exceptthat the Wahl niechani s i lie s been omitted,

Fig. 3 illustrates in front elevation portions of the computing machineshown in Fig. 1 and discloses certain elements of my invention,

Fig. 4 shows, on 'a larger scale, the main portion of the structure ofmy invention separated from the entire combination of 1 1. In thisfigure a key is depressed an the main drive shaft has made a part of arotation.

Figure 4} is a perspective view .of one of the digit disks as viewedfrom a point above, behin and to the right of it, said disk being inabout the position shown in Fig. 4.

Fig. 5 is a right-hand side elevation of my device indicating thevarious means whereby the structure is interconnected with thetypewriter, g

Fig. 6 is a plan view of certain details ap caring in Figs. 2 and 5,

ig. 7 illustrates the structure as viewed from the left-hand end, Fig. 8shows a modified form of'the invention, and

Figs. 9 and 10 are detail views of portions of the said modifiedstructure.

Reference is invited, in the first instance, to Figs. 1, 2 and 3. Thenumeral 1 denotes the frame of a typewriting machine, and this frame ismade with a cross-member l", on which the main is supported. The. saidmain portion, 2, is (as will presently be explained) suitably connectedto operate the actuator 3 of the computing machine, and above saidactuaportion of my invention tor is slidably supported an accumulator ortotalizer 4, such as is ordinarily employed In connection with this-typeof actuating mechanism. The mechanism 2 is connected to be driven from asuitable source of power, such as an electric motor 9, the connect1ons owhich are best shown in Fig. 5, and wluch will be referred to later.

In the mechanism 2 is a shaft 6, wh ch is constantly rotated by themotor 9, at high speed, toward the front of the. machine, i. e., incounterclockwise direction as viewer from the right. On this shaft isournaled a series of devices, which for the purpose 0 this descriptionma be termed oscillators or, preferably, digltal transmitters, sincethereis one such device for each numeral or digit key 8 of thetypewriter, as best seen 1n Fig. 2. Each of these devices transmits tothe balance of the mechanism the necessary motion from the power shaft6. When a key 8 is depressed the transmitter corrc ndlng to said key iscaused to be connects to the shaft 6 during one complete revolution ofsaid shaft, and the transmitter operates upon the corresponding digitmechanism of the actuator 3 toregister a number in the accumulator 4.From this brief description it is seen that the-function of the powerdriven mechanism 2 is to operate the actuator 3, and for this reasonsaid mechanism ma conveniently. be termed a sub-actuator.

1Z1 Fig. 4, the subactuator and its connections are shown on a largerscale, in order to bring out the details which will now'be described. Toeach of the numeral keys 8 is rigidly attached a vertically disposed arm10, and this arm terminates at the top in a head, to which is fixed alaterally projecting stud 11. A stationary rod 12 extends across thesub-actuator, and on this red is hung,

in properly spaced relation to the arms 10 l 1 of the numeral keys, aseries of trip levers 13.' Said levers are held elevated by lightsprings and they extend forward, their front.

ends carryin studs 14. On each of the latter is pivotal y hung a trippawl 15, having a shoulder 15 disposed in the path of travel of the keylever stud" 11, and the pawl is yieldingly maintainedin the ath of thesaid stud by suitable means, suc as a light spring 16.

To the continuously rotating shaft 6 are rigidl secured a series ofratchet wheels 17, and t ese wheels are properly spaced relative to thetrip levers and the keys. Adjacent to each .ratchet wheel is hung one ofthe above mentioned transmitters which comprises a concentric disc 18rigidly combined with an eccentric disc 21 best shown in Fig. 1. Thedisc 18 is made with a shoulder 18",

which normally, as indicated in Fig. 1, abuts a shoulder 13 of the triplever 13. On the side of the disc 18 is hung a ratchet pawl 19,

engagement with the ratchet wheel '17, but it is normally retained outof such engagement by the fact that the end of the awl abuts the saidshoulder 13' of the trip ever. On the eccentric 21 is hung a strap 20,which,

f through the medium offan adjustable rod 24,

connects the sub-actuator with the actuator 3. A series of back-lashpawls 25 are hung 'on a rod 26, above the transmitters, and each pawlengages a shoulder 18 of thedisc 18.

' A de ression of one of the key levers 1 causes t e stud 11 to traveldownward, and

when the key lever approaches the limit of guired to trip the lever 13is so slight that itoes not influence the operation of the typewriter.The moment the tri lever is withdrawn the ratchet pawl 19 is releasedand drawn into engagement with the adjacent ratchet wheel, which thenpicks up the transmitter and imparts a rotation to the latter.

At the end of the rotation the end of thepawl 19' swingsv into the pathof the trip lever shoulder 13, and, as a consequence, the

pawl is raised out of engagement with the ratchet wheel, whereupon theoscillator comes to a sto portant to note that the spring 23 of theratchet pawlacts as a. buffer spring, and I wish to point out that theparts have been so neatly proportioned that the oscillator comes to astop very gently, no sound of a blow being discernible. The back lashpawl 25 drops into place simultaneously, and the pawl spring 23 urgesthe transmitter against this pawl. This is also important because itoperates to maintain the mechanism under tension, whereby rattlingnoises are eliminated. The two pawls 13 and 25, acting on the disk 18 inopposite directions, retain said f its stroke the stud 11 reaches andcarries when the shoulder 18 comes into contact wlth the shoulder 13. Itis im-- disk and the eccentric 21 in correct normal one end it hasa'slot whereby it is given suflicient freedom to'permit of depressingthe lever, 13 but no more freedom. When the transmitter rotates the awl25 gradually rises to the high part of ti disc 18, and during thisrising movement, it draws the trip lever upward and into the path of theshoulder 18. The trip lever is thus positively returned, which 1s very eperiphery of the v important and absolutely necessary, for were it notso, and if the operator absentmindedly held the key depressed,then themachine would as aconsequence repeat 1; but as theillever is l'ltivelyreturned the ipperator wi feel a s ig t blow ainst his n er, if heattempts to hold thdiey depressed, and he will know that he must confinehimself to the use of the ordinary typewriter touch.

Another condition is 'to be guarded against. Where the key is struck avery rapid blow it may happen that the key lever gets back before thetransmitter has completed a rotation, and that it then rebounds, causinga second release of the trip lever. I have safeguarded against thiscondition by swinging the trip pawl 15 out of the way at the time suchrepeating might be possible, and this swinging movement may convenientlybe obtained by providing a heel 15 on the trip pawl and in the path ofthe eccentric disc 21.

At thebase of the sub-actuator is rotatably hung a rod 30, on which ismounted a bail comprising arms 31 and a bar 32, and said bail'is by anadjustable rod 33 connected with the typewriter escapement rocker 34.Each eccentric strap 20 is provided with a heel 20 which, during therotation of the oscillator, swings into the path of said spacing bar 32,and pushes the bar rearward, thereby operating the escapement. It is tobe noted that the numeral keys are relieved directly above thetypewriter universal bar 35, so that they will not strike said bar, andthat, due to this construction, .the typewriter escapement is entirelycontrolled by the subactuator when the latter is operated.

When, however, the shift key, 40, of the typewriter is desprcssed, itbecomes necessary to release the sub-actuator from operation by thenumeral keys, and at the same time to connect said keys to operate thetypewriter escapement, and mechanism suitable for such purpose isillustrated in Figs. 1 and 7 The shift lever 40 is by a 'link 41connected to rock a bell-crank 42, which latter is made with a stud 42engaging a perforation 43 of a connecting bar 43, and this bar is inturnpivotally hung on an arm 44.. of a rock-shaft 45. 1), "extendingacross the sub-actuator, is

rigidly mounted on said shaft 45, and it takes a positioniadjacent to a.toe 15 of each trip pawl 15. When the shift key is depressed themovement of the shift lever, through the instrumeutalities justdescribed, causes said bar to swing into the path of each toe 15, andthereby'to swing the trip pawl out of the path of -the numeral key stud11. The lower end of the connecting bar 43 is journaled on a. rock-frame47, which is provided with a stud 48, and this stud engages the ann 50of a bail suspended from the spacing bar frame 31. Said bail is made Abar 46 (see Fig.-

to support a rod 51 which, when the shift key 1s depressed, takes aposition under and in the ath of a hook 8 of each of the numeraley'levers 8. j

' Froni the foregoing description it is seen that the depression of theshift lever operates to disconnect the sub-actuator and to connect thekey, lever with the escapement. In case it is'desired to maintain thesubactuator disconnected for a longer period, it is only necessary tolock the mechanism just described in inoperative position in a suitablemanner. The mechanism herein provided for this purpose comprises ahandlever 38 rigidly secured to the rock-frame 47 and provided with afinger-piece 39. ,On the end of the bracket 52, which supports saidrock-frame, is mounted a lock-pawl 53, and this pawl is provided with aface 53 for engagement with a stud 54 of the said lever 38. The operatortakes hold of the lever 38 and the lock-lever at the same time andpresses the two levers together with the fingers of his left hand untilthe shoulder 53 engages the stud 54, and the mechanism remains lockeduntil he again withdraws the lock-lever 53 from the lever 38. Attentionis called to a spring 55, which operates upon the bar 43 to urge theparts into normal position, and it will be noticed that the tension ofthis spring also serves to retain the levers 38 and 53 interlocked,until manually released. It is also important to note that theperforation 43 of the bar 43, in which the stud 421 of the bellcrank 42is seated to operate, is elongated in order that the shift key mayremain undisturbed and have freedom of movement while the sub-actuatorremains disconnected.

In the actuator 3 of the lVahl mechanism as heretofore constructed thereis provided what is termed a single key mechanism. which mechanismpermits only one fan 22 to be oscillated at a time, as well known tothose versed in the art. This mechanism is very readily removable, and Iprefer to remove it because it is not required where the sub-actuator isemployed, and also because it retards the key action. A number of otherparts operating upon said fans and combining to form a full strokemechanism may also be removed or omitted, for the reason that thetransmitters are proportioned to produce the correct full strokerequired. which stroke obviously remains invariable.

The single key mechanism which has been removed from the actuator. orthe equivalent of this mechanism, is in the structure of my invention,applied to the numeral key levers, in order that only one such lever maybe depressed at one time, for it is obvious that, if a plurality of keyswere simultaneously dc ressed, a COlllSlOIl would result, which W0 (1tie u the actuator. To this end I have mounted: single key mechanismwhich extends into the path of the rockers 62. This projection is placeda certain dis tance above said rockers, in order that the i projectionmay .enter the single key mechanlsm at the time the stud 11 reaches theshoulder 15 of the trip pawl 15. It isimportant to note'that the keylever does not enter the single key mechanism until it has nearlyreached the end of its stroke, whereas, in the lVahl actuator, the fan22 enters at the beginning of the stroke, and'remains there until thekey has fully returned.

A machine of the Wahl type is adapted for multi-column work, and somecolumns may contain straight figures, while in other columnspunctuations, such as commas and periods, may be interposed, andtotalizers are constructed to suit such different conditions, asiscommonly known. A space is left vacant in the totalizer at the placewhere t punctuation occurs, and the operator is supposed to depress thetypewriter space bar in order to jump over this space, or to depress theproper punctuation key, both of which operations have no influence uponthe computing machine. But the operator may forget that a punctuation isrequired and attempt to set up the next figure, with the result that hewill release the sub-actuator and tie up the machine. Variouspreventative means may be employed, and in Figs. 1 and 3 I have shownmechanism connected to throw a bar into the path o'f-hooks 8 of thenumeral key levers. On top of the totalizer 4 is secured a plate havingone or more V-shaped earns 71 positioned directly above each vacantspace in the totalizer. Pivotally mounted on the stationary machineframe is a lever 72 provided with a V- shaped tooth 72, said tcothextending downward into the path of the cams 71. The totalizer,travellng with the typewriter carriage, operates upon said tooth to rockthe lever and in turn to throw the bar 70 into the path of the keylevers, every time one of said cams passes the said tooth, as aconsequence of which the depression of the key levers is arrested andthe operation of the sub-actuator is prevented. The lever 72 isconnected with the rocking frame 70 by a link 73, as shown in Fig. 1.

While the motor is running the subactuator must be capable of operation,but suppose the motor .suddenly and unexpectcdly comes to a stop, or ifthe operator intentionally stops the motor but forgets to disconnect thesub-actuator, then it becomes necessary to block the operation of thekey levers. Otherwise a person may unintentionally ormaliciously'depress any number of the numeral key levers successivelyand thereby release the corresponding transmitters, and it will be verydifficult for the operator to detect that the transmitters have beentripped, particularly because a device of this kind intariably isenclosed within a casing. The machine will be tied up if more than onetransmitter has been released and the operator then turns on the urrentto start'the motor. Such accident is preventable in various ways. andone means of prevention is illustrated in Figs. 5 and 6, where aspring-held mechanism is provided for locking the single key mechanismWhile the motor is stopped, and where a centrifugal governor of themotor shaft operates upon said mechanism to release the single keymechanism while the motor is running.

The single key locking mechanism comprises a lever 81, on which ispivotally hung a bar 82, and this bar is urged rearward by a spring 88.The bottom of the lever 81 is bent over'horizontally and it terminatesin a cam the motor is started and commences to speedup it is found thatthe governor operates to force the top of said arm 83 forward, againstthe tension of a strong spring 84, and that the pin 87, of the said arm,

pushes the bar 82 forward, against the tension of the spring 88, therebytipping the lever 81 forward sufficiently single key mechanism.Attention is directed to the head of the lever 81, which is bent forwardto-form a hook 81 positioned directly above the rock-shaft 45. On thelatter is simultaneously to release the 81 which, when said lever istilted by the mounted an arm 89, and this arm is free to rock with theshaft within said hook, while the motor is running. When the motorstops, however, and the lever 81 as a consequence is drawn iearward, tis found that the hook also is moved rearward until it touches said arm89, as indicated in dotted outline in Fig. 5. In this position thesingle key mechanism is looked, as explained, and

the numeral keys of the typewriterare made inoperative, but I have shownthat the subactuator can be permanently disconnected by throwing thehand-lever 38, which movement causes the shaft 45 to rock, carrying withit the arm 89, which in turn operates upon the hook 81 to tilt the lever81 and thereby to release the single key mechanism. The perforation ofthe bar 82, in which the stud 87, rides, is made sufficiently elongatedto permit the bar and lever to be moved, as I just explained, withoutdisturbing the gov.- ernor connections, and without adding the extraload of thespring 84. Between the governor and the arm 83 it is well toplace suitable elements, such as a washer 85 and a soft pad 86, forthepurpose of reducing friction and co uent wear on the parts.

It has some fivantages to provide the structure of my invention with anindependent set ofnumeral keys. and such a modified structure is shownin Figs. 8, 9 and 10. But in order to employ such modified device itbecomes necessary to provide more room than most typewriting machinesafford. In the Remington machine, which is the type of machine indicatedin the'drawings, it is possible to obtain such extra space by lengtheninthe. keyhlevers 90, 91 substantially as s own. e sub-actuator, on theother hand, becomes much simplified, because much of the hereinbeforedescribed connections can be omitted.

On the cross bar 92 of the typewriter frame 92 is mounted a base 93which, with the side pieces 94, 94 (see Figs. 9-and10) constitute asub-actuator frame in every important res t similar to the frame of thestructure dzs cribed. The digital transmitters and the eccentric straps95 may also remain substantially as described, and the trip-levers 96are mounted to hold said transmitters inoperative in exactly the mannerstated. But the trip pawl 15 is omitted in this structure, and in itsplace the trip levers have been made to extend forward and to terminatein a series of keys 97. When one .of these keys is depressed, thecorresponding and a transmitter is caused to be release number is set upin the computin machine, as described. To each numeral ey 90 of thetypewriter has been afiixed a vertically disposed arm 98, and this armis formed at the top to support a rotatable roller 99, which lattertakes a sition directly beneath the eccentric 100. Th: function of theseelements is to operate the key lever. It has been stated that the deviceis capable of operating at high speed (a speed of eighteen hundredrevolutions per minute havin been recorded), as a consequence of which te depression of the key lever, caused by the eccentric engaging saidroller, is performed at a speed at least as high as that attained by theordinary finger depression. It is important to note that, due to thepeculiarity of the eccentric movement, the key stroke is relativel slowand increasing toward the end of the stroke, and this is the idealtypewriter key stroke to employ. In operating this form .of theinvention, typewriting can be done without calculating by using thetypewriter keys 90 and 91, which do not affect the com 'uting mechanismth w r w W are sed,

the beginning of v v U the motor operates the cormstgonding numeral keys90 and thus prints e computed numbers.

The single key mechanism is struck tune applied directly to the'triplevers 96, and it comprises a pairofplates 102', 108, mounted in spacedrelation, between which the rockers 104 are pivotally hungsgnd the triplevers are positioned directclly a ve' said rockers in order that theleast epression of a key will brin its lever into the single keymechanism. 'i he ty writer key-lever-escapement connections ave beenrestored, as no connection between the sub-actuator and the escapementis uired, but a mechanism for closingthe sir igle key mechanism when themotor is stopped is, of course, required here as in the first structuredescribed. Such mechanism is indicated in Figs. 9 and 10, where a pin105 is shown slidably" fitted in the side piece 94' of the sub-actuatorframe, said pin having its inner end abutting one of said rockers 104,the last rocker to the right. -The outer end of the pin is operated uponby a cam bar 106 to crowd said rocker against the next followingrockers, and

thereby to lock the single key mechanism,

'when the motor is stopped. The bar 106 is,

the trip levers 96. To this end I have detached one of the rockers 104,and in its place I have placed a pair of half-size rockers 110. Aspecial lever 111 has been provided for operation between said half-sizerockers, and this lever is connected, throu h the medium of anadjustable rod, with t e lever 72 of the actuator frame. It is readilyseen that the tilting of said lever, as hereinbefore explained, resultsin a depression of the lever 111, which lever instantly enters betweenthe said two rockers 110 and thereby locks the single key mechanism.

I claim:

1. In a subcctuator, a power driven shaft, a series of ratchet wheelsrigid on the shaft, a disc adjacent to each wheel and having a pawlurged into engagement with said wheel. a depressible lever normallymaintainin said pawl disengaged, a back-lash pawl, and connectionsbetween said pawl and lever for positively restoring the lever aftereach depression, so as to stop the disc at the end of a. completerevolution.

2. The combination with a typewriter and an actuator, of a series ofeccentric carryin discs for oscillating digit members of said actuator,a power driven shaft turned, said lever depressible to release'the disc'for rotation by said shaft, a back-lash 2171 riding onthe periphery'ofthe disc, a

, positively connectingsaid pawl and lever soxas to restore the lever asthe pawl rises on the eripheral cam of said disc, said bar provid v v atone pivotal point in order that the lever maybe depressed to releasesaid disc, and a yielding member constantly urging thepawl and levertogether. I

3. The combination with a typewriter and.

' an actuator, of a prime mover, a su -actuamover i's'stoplped.

ination with a typewriter and tor having digit members connected operatethe digit members of said actuator,

ke sfor releasing the digit members of said su -actuator to be rotatedby said prime mover, a single keymechani'sm, and means for maintaimngsaid single key mechanism open for key operation while the said primemover is running and closed whilesaid prime mover is not running.

4. The combination with a typewriter and an actuator, of a sub-actuatorcomprising a series of rotatable members for operatmg the digitmechanism of said actuator, a

prime mover for rotating said members, keys.

for releasing the members for rotation, means permitting the release ofonly one member at a time, and means for preventing the release of saidmembers when the prime 5. The com an actuator, of a sub-actuatorincluding a series-of rotatable digit members connected 7 to operatesaid actuator, a prime mover-for rotating said digit members, a triplever maintaining each member unturned, .an arm secured to each keylever of the typewriter, a pawl on each trip lever and yieldinglymaintained in the path of travel of said'arm, said pawl operated upon bya stud of said arm to release the digit member when the key lever isdepressed; and means operated by said prime mover for moving said out ofthe path of said stud.

6. The combination with a typewriter and an actuator, of a series ofpower driven members connected to operate said actuator, a prime mover,a series of keys for releasing said members for rotation by said primemover, means permitting the release of only pawl one member, at a time,means operating to' with an elongated perforation corresponding memberwhen the key lever is depressed, and manual means 0 erableto withdrawsaid pawl from the-pat of am] of said pin.

p 8. The combination with a t pewriter and an attached computingmachme,of a. subactuato'r, a motor connected to operate said sub-actuator, aseries 'of ke s for'releasing' the digit members of the su actuator, asin- 'gle key mechanism, for said keys, .means yieldingly urging saidsingle key mechanism into locked sition when the motor is stopped in orer to prevent key depression, and means coming into action upon startingthe motor for releasing said-mechanism for key de ression.

9. T e combination with numeral keys, I

computing mechanism, and power driven means for operating saidcomputingmechanism under the control of said keys, of connertions. whereby saidkeys control said power driven mechanism, andmeans acting automatically.to lock said numeral keys when thepower is turned 011:.-

10. The combination with numeralkeys, computing mechanism, and acontinuously rotating driver for said computing mechanism, ofconnections whereby said keys control the action of said driver on saidcomputing mechanism, and means acting automatically to lock saidfnumeralkeys when said continuously rotating driver is stopped.

11, The combination with numeral keys, computing mechanism, acontinuously rotating device foractuating said computing mechanism, andconnections whereby said keys control the action said rotating device onsaid computing nixhanism, of a lock for said keys, and acentrifugaldevice on said rotating device connected to release said lookby the rotation of said rotating device.

12. The combinat on with typewriting mechanism including numeral keys.computing mechanism, a power driven actuator for said computingmechanism, and connections whereby said keys may control said actuator.of a lock acting automatically to lock said keys when the powermechanism is inoperative, means operable at will to disable said keyconnections and thereby the computing mechanism,and means connected withsaid disabling means for releasing sa d lock. 13. The combination -withtypewriting mechanism including numeral keys, letter.

keys, a carriage, and carriage feed mechanism; computing mechanism; apower actuator for said computing mechanism; and controlling connectionsfrom said numeral keys to said actuating mechanism, of means operable atwill for connecting said connections and for disconnecting them toenable independent operation of the ty e-.

writing mechanism, and means control ed by said connecting anddisconnecting means for shifting the control of said carriage teed umenv I mechanism to said power actuator when the latter is in operation andto said numeral keys when said. actuating mechanism is out Of operation.3

14. The combination with typewriting mechanism including numeral keysand letter keys, computing mechanism, and connections whereby saidnumeral keys may control said'computing mechanism, of means forconnecting-and disconnecting said connections, carriage feed mechanismincluding a universal bar for the letter keys but not operated by thenumeral keys, a special-universal ba'r for said numeral keys, meanswhereby said computing mechanism may --operate said carriage feedmechanism, and

' connections from the last mentioned means and from said specialuniversal bar to said connect and dlsconnect devices whereby when thecomputing mechanism is in operation it controls the carriage feed andwhereby when said computing mechanism is out of operation the carriagefeed by the numeral keys is controlled through said special universalbar.

15. In a machine of the class described, the combination with a powerdriven digit disk, of a trip dog; adapted to arrest said disk, a pawladapted to prevent back-lash of said disk, and means whereby saidbacklash pawl positively restores said trip dog to arresting position.

16. In a machine of the class described, the combination with a powerdriven digit disk, of a trip dog engaging a shoulder of said disk toprevent forward rotation of the latter, a pawl engaging said disk toprevent back-lash of said disk, and a lost motion'connection betweensaid back-lash pawl and said trip dog, whereby said pawl positively.restores said dog to operative position.

17. In a machine of the class described, the combination with acontinuously rotating shaft, a ratchet wheel fast on said shaft, a diskloose on said shaft and having a driving pawl adapted for engagementwith and disengagement from said ratchet wheel, of a trip dog normallyengaging a shoulder of said disk to prevent forward rotation thereof andalso engaging said pawl to hold the latter away from said ratchet wheel,a second pawl engaging said disk to prevent back-lash thereof, a lostmotion connection and a spring connecting said pawl and said dog, andmeans whereby in the course of its rotation said disk raises said pawland through said connection positively moves said dog into operativeposition, said pawl thereafter snapping down behind its engagingshoulder.

18. In a combined typewriting and calculating machine, the combinationwith typewriting mechanism, and calculating mechanism including anactuator mounted above the typewriter keybm rd, of a ower sub-actuatorbelow said actuator an connected with said actuator by a series ofdlgital lmks, said sub-actuator including a power shaft, 9. series ofeccentrics for operating'said links, and means for coupling saideccentrics one at a time to said power shaft. i 7

19.1111 a combined typewriting and calculat ng machine, the combinationwith the pr nting keys and carriage of the typewriter, and calculatingmechanism," of a power drive including a power-driven part and a seriesof key controlled d" 'tal trans-'- mitters, of carriage feed mechanismincludmg a universal frame, means whereby said frame may be operated bysaid digital transmitters, means whereby said frame ma be operated bysaid keys, and means for s 'ftmg from one such operation to the other.

20. In a calculating machine, the combination with calculating mechanismand a traveling carriage, of a power drive for said calculatingmechanism comprising a series of digital eccentrics and straps and meansfor rivin said eccentrics one at a time, heels on said eccentric stra s,and a universal member operated by said heels for feeding said carriage.I

21. In a combined typewriting and calculating machine, the combinationwith ty writing mechanism including a case s 1ft key, calculatingmechanism, and a power drive for said calculating mechanism, of meanswhereby said power drive is controlled by the numeral keys of thetypewriter, and means whereby an operation of said case shift keydisconnects said power drive.

22. In a combined typewriting and cal culating machine, the combinationwith t pewriting mechanism including carriage eed mechanism and a caseshift key, calsaid calculating mechanism, of means whereby said powerdrive is controlled by the numeral keys of the typewriter, means wherebysaid carriage feed mechanism is operated by said ower drive, and meanswhereby an operation of said case shift key disables said wer mechanismand connects said carriage feed mechanism directly with said numeralkeys.

23. In a combined typewriting and calculating-machine, the combinationof typewriting mechanism including a universal bar operated by theletter keys but not by the numeral keys of the typewriter, a specialuniversal bar shiftable mto and out of osition to be operated by saidnumeral eys, calculating mechanism, a wer drive for said calculatinmechamsm, means whereby said power 've may operate said carriage feedmechanism, and means whereby said case shift key disables said power IIIIll

becontrolled bythe numeral keys of the writer,v means '1 whereby: saidpower rive may operate said carriage feed mecha- 15 msm, hand operatedmeans for disablin said power drive and for connecting sai numeral keysto operate said carriage feed mechanism, a case shift key,- -and means.whereby said case shift key may tempo- 20' rarily o erate saiddisabling means and said means or connecting the numeral keys to thecarriage feed mechanism.

In testimony whereof I have hereunto affixed my signature.

OLIVER o. MARTIN.

